Definition: In this task, you are given an input list A. You need to convert all the alphabets in the list with a number representing their position in the English alphabet. E.g., replace A by 1, B by 2, a by 1, b by 2, and so on.
Input: ['4855', 's', 'B', 'M', '3981', '2263', 't']

4855, 19, 2, 13, 3981, 2263, 20